1654612 - Zooming on a PDF causes blurry/bad smoothing without sharp edges

Status: RESOLVED DUPLICATE of bug 1492303

(Firefox :: PDF Viewer, defect)

Description

[Asif Youssuff]

Attachment: firefox.pdf

From: https://www.reddit.com/r/firefox/comments/hvvc0s/firefox_not_opening_vector_pdf_files_as_vectors/

So I am previewing a vector file inside Firefox and when I start zooming at 100%+, I start seeing pixels, which indicates that the file is not vector. However, if I open the same PDF in Microsoft Edge, the file is perfectly crisp even at 1000% zoom. How is that?

Steps to reproduce:

1. Open attached file.
2. Zoom to 500%

What happens:

Text is not sharp.

Expected result:

Sharp text, like Edge (example attached).

Comment 1

[Asif Youssuff]

Attachment: firefox and edge.png

Comment 2

[jscher2000]

Attachment: PDF printed from MS Word (12pt and 72pt text on letter paper)

I wonder whether paper size (the example PDF is very large) or font size is an issue? These don't look as fuzzy when zoomed.

Comment 3

[jscher2000]

Attachment: PDF printed from MS Word (12pt and 72pt text, fonts embedded)

Embedded fonts example.

Comment 4

[BugBot [:suhaib / :marco/ :calixte]]

The severity field is not set for this bug.
:bdahl, could you have a look please?

For more information, please visit auto_nag documentation.

Comment 5

[Marcela (Please NI request to Brindusa Tot)]

Hi jscher2000!, could be any relation to this bug 1722191?

Comment 6

[jscher2000]

(In reply to Marcela from comment #5)

Hi jscher2000!, could be any relation to this bug 1722191?

Hmm, I have no idea. I am not familiar with how QR codes are drawn, so I don't know whether they are comparable to fonts.

Comment 7

[Marco Castelluccio [:marco]]

Is this still reproducible with latest Nightly?

Comment 8

[Liam England]

I can reproduce blurry edges/words when zooming to 400% on this PDF. Compare with Chrome's PDF viewer, it looks much better.

https://www2.census.gov/geo/maps/cong_dist/uswall/cd117/CD117_US_WallMap.pdf